Clones are not all available from the get go, they will be available to be unlocked as you progress through the Lands.

Note: when you brawl against a higher level player, there is a chance you might be playing in a higher level Land, as that will be the one your opponent progressed to. Winning in a higher level Land, will also award you with Eggs (and loot) from that Land: more gold, more gems, and Clones from that Land that would normally not be available yet.

When you pass a Land, you are still eligible for all the Clones in previous Lands!